 This patent was credited by piano historians Daniel Spillane and Alfred Dolge to Herman's younger brother Henry, who is not listed on the original or reissued United States patents, but is listed jointly with Herman in the 1865 English patent; both historians also identified Henry as the oldest brother.In 1864 sons Henry (August 3, 1835-April 14, 1920) and Ferdinand joined the company, and it was reorganized as Lindeman & Sons.By 1866 they were listed at 173 Mercer, as well as 2 Leroy place and 112 Wooster

The rapid growth of the American piano industry does not appear to have slowed following the financial crisis of in the mid-1850s, although the average sales prices of pianos lowered, but the industry went into decline during the Civil War when both the prices of pianos and value of piano sales compared to the number of workmen dropped.